I have a gremlin- When I have my headlights off, all three brake lights light up properly. When I have the headlights on, the drivers side goes black and does not light up at all when my light are on.
I have take the bulb out and sanded the contact points, to no avail. Any suggestions are greatly appreciated!

 

sounds like you either have a short or two in the tail light wiring harness or a bad relay/switch. The wires are all color coded....start looking around for busted wire. Beyond that, start testing your switches with a multimeter.

 

Replace driver's side bulb. Sometimes the filaments short together.

Regards, Andrew.

 

THANKS- turns out to be the socket- I took the bulb out, popped it back in and it worked- hit a hard bump and bad again- I can't seem to keep the bulb tight.

 

You shut be able to kinda bend the prongs up on the socket.. which will keep snug when you screw the bulb back in

Cheers mate

 

Should***